This standard covers the requirements for steel electrical intermediate metal conduit for use as a raceway for wires or cables of an electrical system. Finished conduit is produced in nominal 10 ft. (3.05 m) lengths@ threaded on each end with one coupling attached. It is protected on the exterior surface with a metallic zinc coating or an alternate corrosion protection coating (See UL 1242 for alternate corrosion-resistant coating(s) requirements) and on the interior surface with a zinc or organic coating. This standard also covers conduit couplings@ elbows@ and conduit lengths other than 10 ft. (3.05 m). Properly assembled systems of conduit@ couplings@ elbows@ and nipples manufactured in accordance with this standard@ and other identified fittings@ provide for the electrical continuity required of an equipment grounding conductor.